Advice on how to quit job gracefully please

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Hello guys i need your advice:
>I joined my first full time EE job after university 5 months ago.All seemed well and nice.
>The problems started to rise since the leadership is not in my country.I was assigned one a big project that will last 1.5 years.I have done pretty much nothing in the past 5 months except Excel sheets etc.
>I have been granted training aboard (more like a vacation since i didnt learn too much there...the people were too busy to learn me usefull stuff).
>The point is while the company invested in me they pretty much have given me nothing to work with.And now after 5 months it turns out we won't do such interesting stuff.
>I want to quit and go in software development..but i don't know how since i'll be a douche.
>Even now i am in training in another country ("training") and i dont know if i should quit right when i come back...or wait at least 1 months to not look like a leech.But if i wait longer the project will start and i'll be in a trap for at least 1-1.5 years.How would you proceed ?
> What makes it harder is that my boss is a nice and motivating guy ...a really generous man ,although my coworkers are douches to me..me being the youngest one.
> So should i quit right after i am back from training (actually more like a vacation) and look like a leech...or stay 1 more month until the dust is settled but the project begins and look like a shit?